2.85mm diameter. Great roundness and consistency. ABS is Acrylonitrile Butadiene Styrene, a very popular plastic for 3D printing.This newly developed ABS filament is one of the easiest to use on the market. When combined with the Ultimaker 2+ and Cura's material profiles, even tricky mechanical parts are realized with ease.• Excellent interlayer adhesion• Good bed adhesion• Enhanced strength for functional prototypes and manufacturing end-use parts• Enhanced mechanical properties over regular ABS• Not suitable for applications where the printed part is exposed to temperatures up to 85°C